[Mr70]

Which Board?
If that's the Black/Red interior Convertible that was in Chevy Hi-Performance 1995 owned by Bill Clements of ChevyCraft..then that car was disproven.It did not come with Aluminum heads,as none of the 1970 LS-6 Chevelles ever did.That particular Chevelle did sell new here in Illinois at Dick Wickstrom Chevrolet.
Only 18 1970 L-78 Chevelles received the L-89 Al.Heads from the factory,before being discontinued.